something addressed to the united states senator, it came from a guy in mississippi who is apparently a frequent letter writer. they could tell from the tone of the letter. dropped the letter in memphis, tennessee but from the nature of the writing, they were able to figure out who they believe is behind it. you better believe that federal authorities are going to have questions for that person. >> greta: it's amazing when people do things like this, they put their names -- a series of letters they have be been writing and point the finger at themselves. >> absolutely. there is concern for the united states postal service, there were a number of employees before it got to the senate facility outside of washington, d.c. if you were driving a united states mail truck and had this parcel in the back of your truck obviously you would have concerns. good news you are alive but you had some deadly stuff in the truck. >> greta: any idea where he got the ricin. >> we have not heard anything about that. that is something authorities may know. they may be withholding because they want to talk t